Abstract:We reported the effect of the sonication output power (SOP), from 120, 180, to 240 W, on the crystal structure, morphology, and magnetic properties of SrFe 12 O 19 nanoparticles synthesized by sonochemical process assisted with heat treatment. X-ray Diffraction analysis of the obtained powder showed the formation of Fe 3 O 4 with low crystallinity degree, which increased with the increase in SOP, together in a crystalline phase identified as SrCO 3 . The formation of SrFe 12 O 19 started at 1073 K, and was completed at 1173 K. However, hexaferrite was obtained with the secondary phases α-Fe 2 O 3 and SrFeO 2.5 . At 1323 K, the secondary phases vanished, and a single phase SrFe 12 O 19 was detected. Vibrating Sample Magnetometry analysis showed that the SrFeO 2.5 phase caused the formation of a hysteresis loop known as the Perminvar magnetic hysteresis loop. At 1323 K, the powder synthesized at 120 W showed a specific magnetization of 67.15 Am 2 /kg at 1.43 × 10 6 A/m, and coercivity of 4.69 × 10 4 A/m, with a spherical-like morphology and average particle size of 56.81 nm obtained by Scanning Electron Microscopy analysis. The increment of SOP promoted a high degree of crystallinity and decrease in crystal size. Additionally, it promoted the formation of secondary phases, induced agglomeration, and modified the morphology of the particles.
En este trabajo se presenta el análisis de la ruptura en la propela de un turbocargador Garret, tratando el tipo y características de fractura mediante la utilización de técnicas de caracterización estructural Difracción de Rayos X, Metalografía, Microscopia Electrónica de Barrido con Espectroscopia de Energía Dispersiva, Pruebas de Dureza y simulación CAD-CAE, la fractura en el material se observó con un microscopio electrónico de barrido, la medición de dureza ayudo a explicar la condición inicial de fractura, posteriormente con Difracción de Rayos X se logró observar la fase estructural del material ANSI 1045, además de correlacionar los resultados obtenidos por metalografía y resultados reportados de dureza, finalmente con el análisis de simulación mediante la teoría del método de elemento finito fue posible identificar y relacionar los espacios de concentración de esfuerzos con la falla mostrando congruencia y la relación con los huecos microscópicos en el material como se muestra en este trabajo.
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